Closest I got was 40lbs lighter. I was 215 she was 175 a little chubby but at 5'10" not too bad. Now that I'm 310ish I don't even want to think about it.
More than one can imagine. Once had a serious relationship with a woman who was 6 inches taller than me and was a large framed lady outweighed me by 50 plus pounds. It was great only problem was trying to have sex doggy style. Near impossible.